The graphene nanoplatelet (GNP) reinforced nickel matrix composites (Ni-GNP) have been processed using two different ball milling approaches, viz, dry ball milling (DM) and solution ball milling (SBM), followed by consolidation using spark plasma sintering (SPS) technique. The composites were reinforced with varying GNP concentration (0.5–2 wt%) and were milled for up to 12 hr to investigate the effect of premixing technique, milling duration, and GNP concentration on the grain size, microstructure, the dispersion of GNP in the nickel matrix, and mechanical behavior of these composites. Ni-GNP nanocomposites exhibited improved microhardness and tensile strength compared to pure nickel, primarily attributed to grain refinement and load transfer strengthening due to the uniform dispersion of these GNPs within the nickel matrix, promoting effective load transfer during tensile deformation. Ni-0.5GNP composites processed via dry milling followed by SPS exhibited the highest tensile yield strength of 586 MPa as compared to pure nickel and other Ni-GNP composites. The contribution of each strengthening mechanism in the overall improvement in yield strength of Ni-GNP composites has been qualitatively calculated/quantified and compared with experimentally obtained tensile properties.

石墨烯纳米片（GNP）增强的镍基复合材料（Ni-GNP）已使用两种不同的球磨方法进行处理，即干球磨（DM）和溶液球磨（SBM），然后使用火花等离子体烧结（SPS）进行固结）技术。复合材料用不同的GNP浓度（0.5–2 wt％）增强，并研磨长达12个小时，以研究预混合技术，研磨时间和GNP浓度对晶粒尺寸，微观结构和GNP分散度的影响。镍基体，以及这些复合材料的机械性能。与纯镍相比，Ni-GNP纳米复合材料具有更高的显微硬度和拉伸强度，这主要归因于晶粒细化和负载转移增强，这是由于这些GNP在镍基体内的均匀分散所致；在拉伸变形过程中促进有效的载荷传递。与纯镍和其他Ni-GNP复合材料相比，通过干磨然后进行SPS加工的Ni-0.5GNP复合材料表现出最高的586 MPa拉伸屈服强度。定性地计算/量化了每种强化机制对Ni-GNP复合材料屈服强度整体提高的贡献，并与通过实验获得的拉伸性能进行了比较。